Unconfined compression test sample preparation device

Abstract

The invention discloses an unconfined compression test sample preparation device which comprises a barrel formwork, wherein an inner bottom support and an inner pressure head are arranged in the barrel formwork; a goblet-shaped funnel is inserted in the barrel formwork; lifting handles are arranged outside a barrel-shaped storage part; a top plug is arranged in the funnel; a guide rod is arranged on the top plug; the barrel formwork is sleeved by a protective barrel; a guide cylinder is arranged above the protective barrel; vertical guide slots are formed in the side wall of the guide cylinder; a through cover is arranged at the top of the guide cylinder; a guide hole is formed in the center of the through cover; the upper part of the guide rod penetrates through the guide hole; a limiting ring plate protruding outwards is arranged on the guide rod; a spring is clamped and compressed between the through cover and the limiting ring plate; and the lifting handles are inserted in the vertical guide slots. The unconfined compression test sample preparation device can ensure a soil sample is continuously compressed by the top plug in a soil sample exhaust process so that all air in the soil sample is discharged and then a complete and regular high-quality test sample free of external and internal holes and cracks can be obtained. Besides, the unconfined compression test sample preparation device is simple in structure, reliable in performance and simple and convenient to manufacture.

Description

technical field [0001] The invention relates to a sample preparation device for geotechnical tests, in particular to a sample preparation device for unconfined compression tests. Background technique [0002] In engineering construction, when the soil is treated or improved, in order to measure the strength or failure characteristics of the improved mixed soil, it is necessary to conduct an unconfined compressive strength test on the mixed soil to obtain its stress-strain curve to determine The strength characteristic parameters of the mixed soil provide the basis for the treatment of the foundation soil. The unconfined compressive strength test is a special case of the triaxial test, and the unconfined strength (q u ), refers to the ultimate strength of the soil against axial compression under unconfined conditions. Its value is equal to the vertical limit pressure σ at the time of soil failure 1 , generally measured with an unconfined pressure instrument. [0003] In t...

AI Technical Summary

Problems solved by technology

However, when using the existing sample preparation device to prepare samples, there are often phenomena of uneven fillers and air trapped in the sample body, resulting in irregular cylindrical samples and / or pores and cracks on the surface and inside, which brings extreme difficulties to sample preparation. Great difficulty, and the yield rate is not high

The reason is that during the sample preparation process of compression molding, the air cannot be discharged in time and completely.

Images